In-plane impact dynamic performance of concave triangle material with negative Poisson&rsquo;s ratio

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Journal of Vibration and Shock ›› 2019, Vol. 38 ›› Issue (17) : 81-87.

In-plane impact dynamic performance of concave triangle material with negative Poisson’s ratio

MA Fangwu, LIANG Hongyu, ZHAO Ying, CHEN Shixian, PU Yongfeng

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Abstract

A concave triangle material with negative Poisson’s ratio was proposed.Under the premise of other geometric parameters of cellular being unchanged, models of this material with different concave forms were established through changing side concave angle of triangle.Using the explicit dynamic finite element software LS-DYNA, effects of concave form and impact velocity on in-plane impact deformation and energy absorption ability of this material were analyzed.Results showed that under in-plane impact loads, plateau stress at impacted end with single side being concave is larger than that with all sides being concave; at fixed end, the smaller the side’s concave degree, the longer the output stress delay time; compared to concave hexagon material with negative Poisson’s ratio, this material absorbs energy more smoothly and its compression amount is larger; with increase in impact velocity, this material reveals a stronger energy absorption ability.

Key words

concave triangle / negative Poisson’s ratio configuration / plateau stress / in-plane impact / energy absorption

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MA Fangwu, LIANG Hongyu, ZHAO Ying, CHEN Shixian, PU Yongfeng. In-plane impact dynamic performance of concave triangle material with negative Poisson’s ratio[J]. Journal of Vibration and Shock, 2019, 38(17): 81-87

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